[%c_effect f8;square;f8;type;Interesting;persistent;true][%c_highlight f7;keyPressed;none;opacity;0.8;square;f7;persistent;false] This is a difficult move—Aronian is known for his subtle positional understanding. The d4-pawn is doomed, so Aronian protects the weakness on f7 before capturing it.
27. g4e3  27... f8b4 [%c_highlight d4;keyPressed;none;opacity;0.8;square;d4;persistent;false,h4;keyPressed;none;opacity;0.8;square;h4;persistent;false] Suddenly, White has a bad position. There's no proper way to defend the d4-pawn, and the queen on h4 is out of play. 28. g2g4 Giri tries to create some tactical chances. 28... e8h8 [%c_effect h8;square;h8;type;GreatFind;persistent;true] 29. g4g5 White has to close the kingside, giving Black a free pass to reinforce his position.